1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <gui/DisplayEventReceiver.h>
18#include <utils/Looper.h>
19
20using namespace android;
21
22int receiver(int fd, int events, void* data)
23{
24    DisplayEventReceiver* q = (DisplayEventReceiver*)data;
25
26    ssize_t n;
27    DisplayEventReceiver::Event buffer[1];
28
29    static nsecs_t oldTimeStamp = 0;
30
31    while ((n = q->getEvents(buffer, 1)) > 0) {
32        for (int i=0 ; i<n ; i++) {
33            if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
34                printf("event vsync: count=%d\t", buffer[i].vsync.count);
35            }
36            if (oldTimeStamp) {
37                float t = float(buffer[i].header.timestamp - oldTimeStamp) / s2ns(1);
38                printf("%f ms (%f Hz)\n", t*1000, 1.0/t);
39            }
40            oldTimeStamp = buffer[i].header.timestamp;
41        }
42    }
43    if (n<0) {
44        printf("error reading events (%s)\n", strerror(-n));
45    }
46    return 1;
47}
48
49int main(int argc, char** argv)
50{
51    DisplayEventReceiver myDisplayEvent;
52
53
54    sp<Looper> loop = new Looper(false);
55    loop->addFd(myDisplayEvent.getFd(), 0, ALOOPER_EVENT_INPUT, receiver,
56            &myDisplayEvent);
57
58    myDisplayEvent.setVsyncRate(1);
59
60    do {
61        //printf("about to poll...\n");
62        int32_t ret = loop->pollOnce(-1);
63        switch (ret) {
64            case ALOOPER_POLL_WAKE:
65                //("ALOOPER_POLL_WAKE\n");
66                break;
67            case ALOOPER_POLL_CALLBACK:
68                //("ALOOPER_POLL_CALLBACK\n");
69                break;
70            case ALOOPER_POLL_TIMEOUT:
71                printf("ALOOPER_POLL_TIMEOUT\n");
72                break;
73            case ALOOPER_POLL_ERROR:
74                printf("ALOOPER_POLL_TIMEOUT\n");
75                break;
76            default:
77                printf("ugh? poll returned %d\n", ret);
78                break;
79        }
80    } while (1);
81
82    return 0;
83}
84